An analytic representation of the three-dimensional structure of monsoon depressions

Summary

The average three-dimensional structure of monsoon depressions is represented mathematically as a quasi-geostrophic horizontal two-dimensional wave perturbation, having no tilt in vertical and in horizontal, with average wavelengths of 2000 km and 1500 km in the zonal and meridional directions, respectively. The wave amplitude is maximum at 700 mb and its vertical variation is represented by a polynomial function ofp.

The wave temperature, the zonal and meridional wind distributions in the zonal plane are compared with the observed distributions associated with monsoon depressions, and a good agreement between them is noticed. Vertical profiles of the convective heating are represented by polynomial functions ofp.